用活性炭净化有害气体,下列哪一项论点是错误的?()
A、活性炭适用于有机溶剂蒸汽的吸附
B、活性炭不适用于处理漆雾
C、活性炭的再生方法均可采用水蒸气法
参考答案:C
在农田生态系统中,小麦属于( )
A.生产者 B.消费者 C.分解者 D.非生物因素
The general demanded that the soldiers _____ at the village before 5p.m. to rescue the victims of the earthquake.
A.will arrive
B.arrive
C.would arrive
D.arrived